“Choose a subject in front of a background with depth. Select your shortest focal length and take a close low viewpoint, below your subject. Find a natural point of focus and take the shot.”
11mm (on crop sensor)
Here the distortion of the wide angle lenses is very obvious. With the curvature of he trees, posts in the background. the exaggeration of the subjects features etc.
For portraiture this not normally complementary as shown her but it can have it uses.